I grew up in the sun, Hawaii and have had severely sunburned lips. I am now 41 and the past 6 mos have had tiny blister recurrance on my bottom lip. It comes and goes in the same spot a couple of times a month. I do not get cold sores, although do get canker sores. This is NOT a cold sore, it is a small blister, it heals and it keeps coming back. I am concerned about lip cancer?